Year	per 1000 people
1960	1
1961	1
1962	1
1963	1
1964	1
1965	1
1966	1
1967	1
1968	1
1969	1.1
1970	1.1
1971	1.1
1972	1.1
1973	1.1
1974	1.1
1975	1.1
1976	1.1
1977	1.2
1978	1.2
1979	1.2
1980	1.3
1981	1.3
1982	1.4
1984	1.4
1985	1.5
1986	1.5
1988	1.6
1990	1.733
1992	1.784
1994	1.858
1996	1.93
1998	1.985
2000	2.035
2002	2.081
2004	2.133
2006	2.186
2008	2.252
2010	2.227
2012	2.297
2014	2.367